[Python] Trying to run my file in windows command prompt but can't find pytube

I'm trying to make a python file that converts the argument (a youtube link) provided in command prompt something like C:\Users\Username\Desktop>YTMP3.py URL however, the script can't find the third party library named pytube, the resulting error is ModuleNotFoundError: No module named 'pytube'

Code:

import pytube
import os
import sys
from pathlib import Path
from pytube import YouTube

destination = 'C:/Desktop/' + str(Path.home()) + '/Downloads'

def download_audio(url):
yt = YouTube(url)
print("Title: ", yt.title)
base, ext = os.path.splitext(yt)
newfile = base + ".mp3"
print("Downloading...")
yt.streams.filter(only_audio=True).first().download(output_path=destination, filename=newfile)
print("Download complete")

if __name__ == "__main__":
download_audio(str(sys.argv[1]))


I made sure the module was installed, I was expecting the module to run normally and download the YouTube URL I provided.

Continue reading...